posted does not mean "pinned on a bulletinboard." It means "with the persons who hold the post named on each post." It goes without saying that the org board is visibly displayed and known. (OODs 28 Oct 70)
POSTED
ScnMaster
(one's name) placed upon a notice board as no longer a member (of a club, etc.) for nonpayment of dues or other irregularity. —AcademyLevel I Glossary - Approved November 1990